UNIX: Fifty Years and Counting

The UNIX Operating System has a long and influential history in computing and Brian Kernighan’s new book, UNIX: A History and a Memoir tells that story. I started teaching UNIX (and C programming) for Learning Tree back in 1984. A lot has changed since then including the advent of Linux, the move to PCs, and […]
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Dovecot is Now My Favorite Unix/Linux IMAP Mail Download Server

As you may know, there are two kinds of email systems: Outlook, and everything else. The non-Outlook-based email world consists mainly of three kinds of software: MDAs, MUAs, and anti-spam/antivirus. Dovecot is the glue between your MDA and your MUA. MDAs are the mail delivery agents, such as SendMail, PostFix, OpenSMTPD, and more. An MDA […]
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Practical Steps Toward Compliance With OpenSCAP

In this blog I described some of the logical problems with vulnerability scanners. False positive and false negative errors. Additionally, the worry that problems exist but our tool hasn’t even tried looking for them. Let’s try to make this practical! I’m working on a consulting job as a sub-sub-contractor on a U.S. Department of Defense […]
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Vulnerability Scanners: How Helpful Are They?

Many of you must follow formal cybersecurity requirements. PCI DSS, if you accept credit or debit cards. HIPAA, if you store or process health care data. Then, if you’re with the Department of Defense or other U.S. Government agencies, there are more detailed configuration requirements. In theory, you could just read the requirements and then […]
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Why Order Matters

While it may seem strange, sometimes it is possible for a mathematical expression to have two different right answers. Consider: This expression has been discussed on the Internet since 2011! The correct answer could be either 2 or 288. Really. It depends on how the expression is evaluated. To understand that we have to understand […]
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